<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>JS快速入门</title>
</head>
<body>
<button id="btn">点我呀</button>
</body>

<!--<script src="my.js"></script>-->
    <script>
      //let a=prompt("提示炸弹倒计时：");
     //alert(a);
     // console.log(a);
      confirm("请问删除吗？")
    </script>
</html>